/*
 * Copyright (c) 1996, 2007, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
package java.awt.peer;

import java.awt.Adjustable;
import java.awt.ScrollPane;
import java.awt.ScrollPaneAdjustable;

/**
 * The peer interface for {@link ScrollPane}.
 *
 * The peer interfaces are intended only for use in porting
 * the AWT. They are not intended for use by application
 * developers, and developers should not implement peers
 * nor invoke any of the peer methods directly on the peer
 * instances.
 */
public interface ScrollPanePeer extends ContainerPeer {

  /**
   * Returns the height of the horizontal scroll bar.
   *
   * @return the height of the horizontal scroll bar
   * @see ScrollPane#getHScrollbarHeight()
   */
  int getHScrollbarHeight();

  /**
   * Returns the width of the vertical scroll bar.
   *
   * @return the width of the vertical scroll bar
   * @see ScrollPane#getVScrollbarWidth()
   */
  int getVScrollbarWidth();

  /**
   * Sets the scroll position of the child.
   *
   * @param x the X coordinate of the scroll position
   * @param y the Y coordinate of the scroll position
   * @see ScrollPane#setScrollPosition(int, int)
   */
  void setScrollPosition(int x, int y);

  /**
   * Called when the child component changes its size.
   *
   * @param w the new width of the child component
   * @param h the new height of the child component
   * @see ScrollPane#layout()
   */
  void childResized(int w, int h);

  /**
   * Sets the unit increment of one of the scroll pane's adjustables.
   *
   * @param adj the scroll pane adjustable object
   * @param u the unit increment
   * @see ScrollPaneAdjustable#setUnitIncrement(int)
   */
  void setUnitIncrement(Adjustable adj, int u);

  /**
   * Sets the value for one of the scroll pane's adjustables.
   *
   * @param adj the scroll pane adjustable object
   * @param v the value to set
   */
  void setValue(Adjustable adj, int v);
}
